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| <a href="#gst-plugins-bad-plugins-videodetect.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#gst-plugins-bad-plugins-videodetect.description" class="shortcut">Description</a> |
| | |
| <a href="#gst-plugins-bad-plugins-videodetect.properties" class="shortcut">Properties</a> |
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| <div class="refentry"> |
| <a name="gst-plugins-bad-plugins-videodetect"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-bad-plugins-videodetect.top_of_page"></a>videodetect</span></h2> |
| <p>videodetect — Detect patterns in a video signal</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv"> |
| <a name="gst-plugins-bad-plugins-videodetect.synopsis"></a><h2>Synopsis</h2> |
| <pre class="synopsis">struct <a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect" title="struct GstVideoDetect">GstVideoDetect</a>; |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-videodetect.properties"></a><h2>Properties</h2> |
| <pre class="synopsis"> |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--message" title='The "message" property'>message</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-count" title='The "pattern-count" property'>pattern-count</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-data-count" title='The "pattern-data-count" property'>pattern-data-count</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-height" title='The "pattern-height" property'>pattern-height</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-sensitivity" title='The "pattern-sensitivity" property'>pattern-sensitivity</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-width" title='The "pattern-width" property'>pattern-width</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--bottom-offset" title='The "bottom-offset" property'>bottom-offset</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--left-offset" title='The "left-offset" property'>left-offset</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct |
| "<a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-center" title='The "pattern-center" property'>pattern-center</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-videodetect.description"></a><h2>Description</h2> |
| <p> |
| This plugin detects <a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-count" title='The "pattern-count" property'><span class="type">"pattern-count"</span></a> squares in the bottom left |
| corner of the video frames. The squares have a width and height of |
| respectively <a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-width" title='The "pattern-width" property'><span class="type">"pattern-width"</span></a> and <a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-height" title='The "pattern-height" property'><span class="type">"pattern-height"</span></a>. |
| Even squares must be black and odd squares must be white. |
| </p> |
| <p> |
| When the pattern has been found, <a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--pattern-data-count" title='The "pattern-data-count" property'><span class="type">"pattern-data-count"</span></a> squares |
| after the pattern squares are read as a bitarray. White squares represent a 1 |
| bit and black squares a 0 bit. The bitarray will will included in the element |
| message that is posted (see below). |
| </p> |
| <p> |
| After the pattern has been found and the data pattern has been read, an |
| element message called <code class="classname">"GstVideoDetect"</code> will |
| be posted on the bus. If the pattern is no longer found in the frame, the |
| same element message is posted with the have-pattern field set to <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>. |
| The message is only posted if the <a class="link" href="gst-plugins-bad-plugins-videodetect.html#GstVideoDetect--message" title='The "message" property'><span class="type">"message"</span></a> property is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a>. |
| </p> |
| <p> |
| The message's structure contains these fields: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"><p> |
| <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> |
| <code class="classname">"have-pattern"</code>: |
| if the pattern was found. This field will be set to <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> for as long as |
| the pattern was found in the frame and set to FALSE for the first frame |
| that does not contain the pattern anymore. |
| </p></li> |
| <li class="listitem"><p> |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> |
| <code class="classname">"timestamp"</code>: |
| the timestamp of the buffer that triggered the message. |
| </p></li> |
| <li class="listitem"><p> |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> |
| <code class="classname">"stream-time"</code>: |
| the stream time of the buffer. |
| </p></li> |
| <li class="listitem"><p> |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> |
| <code class="classname">"running-time"</code>: |
| the running_time of the buffer. |
| </p></li> |
| <li class="listitem"><p> |
| <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> |
| <code class="classname">"duration"</code>: |
| the duration of the buffer. |
| </p></li> |
| <li class="listitem"><p> |
| <span class="type">guint64</span> |
| <code class="classname">"data-uint64"</code>: |
| the data-pattern found after the pattern or 0 when have-signal is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>. |
| </p></li> |
| <li class="listitem"><p> |
| <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> |
| <code class="classname">"data"</code>: |
| the data-pattern found after the pattern or 0 when have-signal is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>. |
| </p></li> |
| </ul></div> |
| <p> |
| </p> |
| <p> |
| </p> |
| <div class="refsect2"> |
| <a name="idp22388416"></a><h3>Example launch line</h3> |
| <div class="informalexample"> |
| <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td class="listing_lines" align="right"><pre>1</pre></td> |
| <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch videotestsrc <span class="gtkdoc opt">!</span> videodetect <span class="gtkdoc opt">!</span> ffmpegcolorspace <span class="gtkdoc opt">!</span> ximagesink</pre></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| |
| </div> |
| <p> |
| </p> |
| <p> |
| Last reviewed on 2007-05-30 (0.10.5) |
| </p> |
| <div class="refsynopsisdiv"> |
| <h2>Synopsis</h2> |
| <div class="refsect2"> |
| <a name="idp22391520"></a><h3>Element Information</h3> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">plugin</span></p></td> |
| <td> |
| <a class="link" href="gst-plugins-bad-plugins-plugin-videosignal.html#plugin-videosignal">videosignal</a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term">author</span></p></td> |
| <td>Wim Taymans <wim@fluendo.com></td> |
| </tr> |
| <tr> |
| <td><p><span class="term">class</span></p></td> |
| <td>Filter/Effect/Video</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="idp22398976"></a><h3>Element Pads</h3> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>sink</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">direction</span></p></td> |
| <td>sink</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">presence</span></p></td> |
| <td>always</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>video/x-raw-yuv, format=(fourcc){ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term">name</span></p></td> |
| <td>src</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">direction</span></p></td> |
| <td>source</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">presence</span></p></td> |
| <td>always</td> |
| </tr> |
| <tr> |
| <td><p><span class="term">details</span></p></td> |
| <td>video/x-raw-yuv, format=(fourcc){ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]</td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <p> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-videodetect.details"></a><h2>Details</h2> |
| <div class="refsect2"> |
| <a name="GstVideoDetect"></a><h3>struct GstVideoDetect</h3> |
| <pre class="programlisting">struct GstVideoDetect { |
| GstVideoFilter videofilter; |
| |
| gint width, height; |
| GstVideoFormat format; |
| |
| gboolean message; |
| gint pattern_width; |
| gint pattern_height; |
| gint pattern_count; |
| gint pattern_data_count; |
| gdouble pattern_center; |
| gdouble pattern_sensitivity; |
| gint left_offset; |
| gint bottom_offset; |
| |
| gboolean in_pattern; |
| }; |
| </pre> |
| <p> |
| Opaque datastructure. |
| </p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-videodetect.property-details"></a><h2>Property Details</h2> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--message"></a><h3>The <code class="literal">"message"</code> property</h3> |
| <pre class="programlisting"> "message" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> : Read / Write / Construct</pre> |
| <p>Post statics messages.</p> |
| <p>Default value: TRUE</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--pattern-count"></a><h3>The <code class="literal">"pattern-count"</code> property</h3> |
| <pre class="programlisting"> "pattern-count" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct</pre> |
| <p>The number of pattern markers.</p> |
| <p>Allowed values: >= 0</p> |
| <p>Default value: 4</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--pattern-data-count"></a><h3>The <code class="literal">"pattern-data-count"</code> property</h3> |
| <pre class="programlisting"> "pattern-data-count" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct</pre> |
| <p>The number of extra data pattern markers.</p> |
| <p>Allowed values: >= 0</p> |
| <p>Default value: 5</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--pattern-height"></a><h3>The <code class="literal">"pattern-height"</code> property</h3> |
| <pre class="programlisting"> "pattern-height" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct</pre> |
| <p>The height of the pattern markers.</p> |
| <p>Allowed values: >= 1</p> |
| <p>Default value: 16</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--pattern-sensitivity"></a><h3>The <code class="literal">"pattern-sensitivity"</code> property</h3> |
| <pre class="programlisting"> "pattern-sensitivity" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct</pre> |
| <p>The sensitivity around the center for detecting the markers (0.0 = lowest, 1.0 highest).</p> |
| <p>Allowed values: [0,1]</p> |
| <p>Default value: 0.3</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--pattern-width"></a><h3>The <code class="literal">"pattern-width"</code> property</h3> |
| <pre class="programlisting"> "pattern-width" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct</pre> |
| <p>The width of the pattern markers.</p> |
| <p>Allowed values: >= 1</p> |
| <p>Default value: 4</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--bottom-offset"></a><h3>The <code class="literal">"bottom-offset"</code> property</h3> |
| <pre class="programlisting"> "bottom-offset" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct</pre> |
| <p>The offset from the bottom border where the pattern starts.</p> |
| <p>Allowed values: >= 0</p> |
| <p>Default value: 0</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--left-offset"></a><h3>The <code class="literal">"left-offset"</code> property</h3> |
| <pre class="programlisting"> "left-offset" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write / Construct</pre> |
| <p>The offset from the left border where the pattern starts.</p> |
| <p>Allowed values: >= 0</p> |
| <p>Default value: 0</p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstVideoDetect--pattern-center"></a><h3>The <code class="literal">"pattern-center"</code> property</h3> |
| <pre class="programlisting"> "pattern-center" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> : Read / Write / Construct</pre> |
| <p>The center of the black/white separation (0.0 = lowest, 1.0 highest).</p> |
| <p>Allowed values: [0,1]</p> |
| <p>Default value: 0.5</p> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-bad-plugins-videodetect.see-also"></a><h2>See Also</h2> |
| <a class="link" href="gst-plugins-bad-plugins-videomark.html#GstVideoMark" title="struct GstVideoMark"><span class="type">GstVideoMark</span></a> |
| </div> |
| </div> |
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